Pipe system

Abstract

This pipe system has a pressurized feed conduit and an outflow conduit for a hydraulic fluid. It furthermore has parts (6, 8, 10) for connection to a hydraulically actuable device. The intention is to create a pipe system which is improved as regards safety of operation and fire protection and has a smaller space requirement. This is achieved by the fact that the pressurized feed conduit is arranged inside the outflow conduit, this arrangement being maintained right into the interior of the hydraulically actuable device.

What is claimed as new and desired to be secured by Letters Patent of the United States is: 
     
       1. A pipe system for hydraulic installations comprising: a pressurized feed conduit and an outflow conduit for a hydraulic fluid, the pressurized feed conduit being disposed inside and surrounded by the outflow conduit;   a connection part connected to conduct hydraulic fluid between at least one hydraulically actuable device and the feed and outflow conduits,   the connection part including a T-shaped piece dividing the connection part into an inner passage communicating with the pressurized feed conduit and a pressurized feed inlet of the hydraulically actuable device, and an outer passage surrounding the inner passage throughout the connection part and communicating with the outflow conduit and an outflow outlet of the hydraulically actuable device, the T-shaped piece being cast integrally as part of the connection part;   means to sealingly fasten the connection part to the pressurized feed conduit and outflow conduit; and,   means to sealingly fasten the connection part to the hydraulically actuable device.   
     
     
       2. The pipe system as claimed in claim 1, comprising at least two connection parts for connecting at least two hydraulically actuable devices in series, and intermediate pieces fitted between adjacent connection parts to connect respective inner passages and outer passages of the connection parts, the intermediate pieces having means to compensate for at least one of manufacturing tolerances and thermal expansions, and means to sealingly fasten the intermediate parts to the connecting parts. 
     
     
       3. The pipe system as claimed in claim 2, wherein the intermediate piece comprises two parts including an inner conduit and a separate outer conduit. 
     
     
       4. The pipe system as claimed in claim 3, wherein the intermediate piece comprises: an inner, pressurized feed conduit having a rigid tube and means for inserting the tube pressure-tightly into corresponding sockets of the respectively adjacent connection parts; and   an outer tube for the outflow conduit including opposing end flanges having projecting tube stubs and an elastic steel bellows welded at both ends to the stubs of each flange, and means for connecting the flanges to the connection parts.   
     
     
       5. The pipe system as claimed in claim 2, wherein the intermediate piece comprises one part forming the inner and outer conduits.   
     
     
       6. The pipe system as claimed in claim 5, wherein the intermediate piece comprises: opposing end flanges fastened to the adjacent connection parts, each flange having an inner tube stub for the pressurized feed conduit and an outer tube stub surrounding the inner tube stub for the outflow conduit projecting from the flange;   means for sealing the end flanges to the connection parts; and   an inner elastic steel bellows connecting the respective feed tube stubs of each flange and an outer elastic steel bellows connecting the respective outer stubs of each flange.   
     
     
       7. The pipe system as claimed in claim 6, the intermediate piece further comprising a protective tube rigidly connected to one of the flanges and covering the outflow conduit.   
     
     
       8. The pipe system as claimed in claim 7, wherein the protective tube has a cylindrical shape. 
     
     
       9. A pipe system for hydraulic installations comprising: a pressurized feed conduit and an outflow conduit for a hydraulic fluid, the pressurized feed conduit being disposed within the outflow conduit to be surrounded by a flow in the outflow conduit;   at least one connection part for connecting the pressurized feed conduit and the outflow conduit to a respective pressurized feed inlet and an outlet of a hydraulically actuable device;   each connection part having a T-shaped piece dividing the connection part into inner and outer T-shaped passages, the outer passage surrounding the inner passage, the inner passage communicating with the pressurized feed conduit and the outer passage communicating with the outflow conduit, the T-shaped piece being cast integrally as part of the connection part;   means to sealingly fasten the at least one connecting part to the pressurized feed inlet and outlet; and   intermediate pieces connecting adjacent connection parts, the intermediate pieces having opposing end flanges fastened to the connection parts, each flange having an inner tube stub for the pressurized feed conduit and an outer tube stub surrounding the inner tube stub for the outflow conduit, the outer tube stub projecting from the flange, an inner elastic steel bellows connecting the respective feed tube stubs of each flange and an outer elastic steel bellows connecting the respective outer stubs of each flange, and means for connecting the flanges to the connection parts to seal for pressurized flow therethrough.   
     
     
       10. The pipe system as claimed in claim 9, wherein each intermediate piece further comprises a protective tube rigidly connected to one of the flanges and covering the outflow conduit. 
     
     
       11. The pipe system as claimed in claim 10, wherein the protective tube has a cylindrical shape. 
     
     
       12. A pipe system for hydraulic installations comprising: a pressurized feed conduit and an outflow conduit for a hydraulic fluid, the pressurized feed conduit being disposed inside the outflow conduit to be surrounded by a flow in the outflow conduit;   at least one connection part for connecting the pressurized feed conduit and the outflow conduit to a respective pressurized inlet and outflow outlet of a hydraulically actuable device;   each connection part having a T-shaped piece dividing the connection part into an inner and an outer T-shaped passage, the outer passage surrounding the inner passage, the inner passage communicating with the pressurized feed conduit and the outer passage communicating with the outflow conduit, the T-shaped piece being cast integrally as part of the connection part; and   means to sealingly fasten the at least one connecting part to the pressurized feed inlet and outlet for pressurized flow;   intermediate pieces fastened between adjacent connection parts, the intermediate pieces comprising two parts including an inner, pressurized feed conduit having a rigid tube and means for inserting the tube pressure-tightly into corresponding sockets of the respective adjacent connection parts, an outer tube for the outflow conduit including opposing end flanges having projecting tube stubs and an elastic steel bellows welded at both ends to the stubs of each flange, and means for connecting the flanges to the connection parts to seal for pressurized flow therethrough.